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Note 2 - Share Exchange Transaction (Details Textual) - USD ($)
$ in Millions
Feb. 12, 2015
Dec. 31, 2016
Dec. 31, 2015
Feb. 11, 2015
Common Stock, Shares, Outstanding   49,667,340 49,107,901  
Ormat Industries Ltd. [Member]        
Percentage of Public Float Before Transition to Noncontrolled Public Company       40.00%
Percentage of Public Float After Transition to Noncontrolled Public Company 76.00%      
Share Exchange Shares Granted Per Share 0.2592      
Conversion of Stock, Shares Issued 30,200,000      
Stock Issued During Period, Shares, New Issues 3,000,000      
Common Stock, Shares, Outstanding 48,500,000     45,500,000
Sale of Stock, Consideration Received on Transaction $ 15.4      
Ormat Industries Ltd. [Member] | Shares Issued to Self, Deducted [Member]        
Conversion of Stock, Shares Issued 27,200,000      
Ormat Industries Ltd. [Member] | Sale of Stock, Other Assets Received [Member]        
Sale of Stock, Consideration Received Per Transaction $ 0.6      
Ormat Industries Ltd. [Member] | Sale of Stock, Land and Buildings Received [Member]        
Sale of Stock, Consideration Received Per Transaction 12.1      
Ormat Industries Ltd. [Member] | Sale of Stock, Liabilities Assumed [Member]        
Sale of Stock, Consideration Received Per Transaction $ 0.5